package com.iwhalecloud.bss.kite.cucc.service.util;

import sun.misc.BASE64Decoder;
import sun.misc.BASE64Encoder;

import javax.crypto.Cipher;
import javax.crypto.spec.IvParameterSpec;
import javax.crypto.spec.SecretKeySpec;

/** 
 * AES 是一种可逆加密算法，对用户的敏感信息加密处理 对原始数据进行AES加密后，在进行Base64编码转化； 
 */  
public class AESOperator {  
    /* 
     * 加密用的Key 可以用26个字母和数字组成 此处使用AES-128-CBC加密模式，key需要为16位。 
     */  
    private String ivParameter = "0123456789abcdef";  
    private static AESOperator instance = null;  
  
    private AESOperator() {  
  
    }  
  
    public static AESOperator getInstance() {  
        if (instance == null)  
        {    instance = new AESOperator(); }
        return instance;  
    }  
  
    // 加密  
    public String encrypt(String sSrc,String sKey) throws Exception{  
        String result = "";  
        Cipher cipher;  
        cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");  
        byte[] raw = sKey.getBytes();  
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");  
        IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());// 使用CBC模式，需要一个向量iv，可增加加密算法的强度  
        cipher.init(Cipher.ENCRYPT_MODE, skeySpec, iv);  
        byte[] encrypted = cipher.doFinal(sSrc.getBytes("utf-8"));  
        result = new BASE64Encoder().encode(encrypted);  
        // 此处使用BASE64做转码。  
        return result;  
                  
    }  
  
    // 解密  
    public String decrypt(String sSrc,String sKey) throws Exception{  
        byte[] raw = sKey.getBytes("ASCII");  
        SecretKeySpec skeySpec = new SecretKeySpec(raw, "AES");  
        Cipher cipher = Cipher.getInstance("AES/CBC/PKCS5Padding");  
        IvParameterSpec iv = new IvParameterSpec(ivParameter.getBytes());  
        cipher.init(Cipher.DECRYPT_MODE, skeySpec, iv);  
        byte[] encrypted1 = new BASE64Decoder().decodeBuffer(sSrc);// 先用base64解密  
        byte[] original = cipher.doFinal(encrypted1);  
        String originalString = new String(original, "utf-8");  
        return originalString;  
    } 
}
